I was tracing how Phoenix stops double spending and expected the usual UTXO story check the input, mark it spent, move on. That's not quite what happens.
Every note Dusk tracks lives as a hash in a Merkle tree. When you spend one, you don't point to it directly you generate a nullifier, a value computed from your secret key and the note, deterministic enough to block reuse but unlinkable enough that no observer can trace it back to which leaf in the tree it came from.
That's the clever part. But it means the network can't verify a spend the way a transparent chain does, by simply checking a specific record. It has to trust a single aggregated ZK proof that everything ownership, non-double-spend, balance holds simultaneously. There's no way to inspect individual claims after the fact, by design.
So the same unlinkability that gives you privacy is also what makes the system's correctness rest entirely on the proof system itself, not on auditable state. Privacy and verifiability end up in tension, not addition.
Makes me wonder how Dusk's approach to circuit review scales as Phoenix sees more institutional volume.
#dusk $DUSK @Dusk
Every note Dusk tracks lives as a hash in a Merkle tree. When you spend one, you don't point to it directly you generate a nullifier, a value computed from your secret key and the note, deterministic enough to block reuse but unlinkable enough that no observer can trace it back to which leaf in the tree it came from.
That's the clever part. But it means the network can't verify a spend the way a transparent chain does, by simply checking a specific record. It has to trust a single aggregated ZK proof that everything ownership, non-double-spend, balance holds simultaneously. There's no way to inspect individual claims after the fact, by design.
So the same unlinkability that gives you privacy is also what makes the system's correctness rest entirely on the proof system itself, not on auditable state. Privacy and verifiability end up in tension, not addition.
Makes me wonder how Dusk's approach to circuit review scales as Phoenix sees more institutional volume.
#dusk $DUSK @Dusk
